Weighted harmonic average

Ten workers will do some work in 2 minutes, five in 10 minutes, and three in 6 minutes. How many minutes per average worker per worker?

Correct answer:

r =  3 min

Step-by-step explanation:

w1=10 w2=5 w3=3 t1=2 min t2=10 min t3=6 min  r=w1 t11+w2 t21+w3 t31w1+w2+w3=10 21+5 101+3 6110+5+3=3 min



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